PSZ2 G086.93+53.18. Top and bottom rows: full-resolution and 26″ images (weighting=‘Briggs’ and robust=−0.5) at 144 MHz (left) and 650 MHz (right). White-coloured radio contours are drawn at levels of 2.5σ_rms × [ − 1, 1, 2, 4, 8, 16, 32], with σ_rms being the noise level at each frequency (see Table 3). The negative contour level is drawn with a dashed white line. The dashed white circle in each map shows the R = 0.5R_SZ, 500 region obtained from M_SZ, 500, with the cross showing the cluster centre. The dashed yellow circle in the bottom right panel shows the position of the mock radio halo.